Internal combustion engine with intermediate pipe inserted in passage between cylinder head and crankcase

ABSTRACT

An internal combustion engine in which the cylinder head is secured at the crankcase by means of cylinder head bolts and in which rigid spacer elements are provided between the cylinder head and the crankcase within the area of the cylinder head bolts; the radial collar of the liquid-cooled cylinder liner is mounted directly on the separating surface of the crankcase facing the cylinder head while an intermediate pipe is inserted into the through-passage for the cooling water between the cylinder head and crankcase; the intermediate pipe includes a radial collar and one annular seal each is inserted between the separating surface of the cylinder head and the radial collar of the intermediate pipe as also between the separating surface of the crankcase and the radial collar.

United States Patent [191 Conrad Oct. 16, 1973 [75] Inventor: UlrichConrad, Ludwigsburg,

Germany [73] Assignee: Daimler-Benz Aktiengesellschaft,

Stuttgart-Unterturkheim, Germany [22] Filed: Sept. 1, 1972 [21] Appl.No.: 285,646

[30] Foreign Application Priority Data Sept. 1, 1971 Germany P 21 43734.3

[52] US. Cl. 123/41.84, 123/193 CH, 92/171 [56] References Cited UNITEDSTATES PATENTS 6/1945 Sorensen et al. 123/4l.72 X l/l956 Brill l23/4l.82X

3,363,608 1/1968 Scherenberg et a1. 123/193 CH X 3,410,256 11/1968l-lerschmann 123/193 R X 3,436,085 4/1969 Polk 123/193 CH X 3,577,9615/1961 Deutschmann 123/4182 X 3,653,369 4/1972 Fangman et al 123/193 CHPrimary Examiner-Al Lawrence Smith AttorneyPaul M. Craig, Jr. et a1.

[5 7 ABSTRACT An internal combustion engine in which the cylinder headis secured at the crankcase by means of cylinder head bolts and in whichrigid spacer elements are provided between the cylinder head and thecrankcase within the area of the cylinder head bolts; the radial collarof the liquid-cooled cylinder liner is mounted directly on theseparating surface of the crankcase facing the cylinder head while anintermediate pipe is inserted into the through-passage for the coolingwater between the cylinder head and crankcase; the intermediate pipeincludes a radial collar and one annular seal each is inserted betweenthe separating surface of the cylinder head and the radial collar of theintermediate pipe as also between the separating surface of thecrankcase and the radial collar.

INTERNAL COMBUSTION ENGINE WITH INTERMEDIATE PIPE INSERTED IN PASSAGEBETWEEN CYLINDER HEAD AND CRANKCASE The present invention relates to aninternal combustion engine in which the cylinder head is secured at thecrankcase by means of cylinder head bolts and nonyielding, rigid spacerelements arranged between these housing parts within the area of thecylinder head bolts are provided, and in which the radial collar of theliquid-cooled cylinder liners is mounted directly on the separatingsurface of the crankcase on the side of the cylinder head and anintermediate pipe is inserted into the through-passage for the coolingwater between cylinder head and crankcase which is selaed off by meansof sealing rings. In one prior art internal combustion engine (GermanPatent 1,301,655 of this type, the spacer elements serve to relieve thecrankcase from disadvantageous notch'stresses within the area of theseats for the wet cylinder liners. Metal seals are inserted between thecollar of the cylinder liners and the cylinder head, which seal thecombustion spaces in a gas-tight manner with respect to the separatingjoint between cylinder head and crankcase. Three separating jointsresult therefrom which have to be sealed separately with respect to thecooling water passage between cylinder head and crankcase.

The present invention is concerned with the task to provide astructurally simple and effective seal of the cooling water passage withrespect to the three separating joints between cylinder head, gas seal,spacer element and crankcase. The underlying problems are solvedaccording to the present inention in that the intermediate pipe ortubular member includes a radial collar, and in that one sealing ringeach is inserted between the separating surface of the cylinder head andthe collar as also between the separating surface of the crankcase andthe collar. It is achieved by the present invention that only two sealsare required for the three separating joints. The intermediate pipe ortubular member is clamped-in essentially non-displaceably by its collarso that no wear occurs. Commerically available O-rings can be used assealing elements so that the expenditures for the replacement andrenewal of the seal of the cooling water passage are small.

If the arrangement is made in such a manner that the pipe ends on bothsides of thecollar. are axially displaceably inserted into arespective'bore of the cylinder head and of the crankcase, then auniform compression at the seals will be established by reason of thefree displaceability of the intermediate pipe.

Accordingly, it is an object of the present invention to provide aninternal combustion engine with an intermediate pipe inserted into thecooling water through- 'passage between cylinder head and crankcasewhich avoids the aforementioned shortcomings and drawbacks encounteredin the prior art by simple means.

Another object of the present invention resides in a liquid-cooledinternal combustion engine which reduces the number of seals requiredfor effectively sealing the intemediate pipe inserted into the coolingwater passage between cylinder head and crankcase.

A further object of the present invention resides in an intenalcombustion engine of th type described above which reduces the number ofseals necessary in the connection for the cooling liquid betweencrankcase and cylinder head.

A still further object of the present invention resides in an internalcombustion engine with intemediate pipes inserted into thethrough-passages for the cooling water between cylinder head andcrankcase which not only utilizes relatively few parts but permits theuse of commerically available seals thus reducing the cost in case ofreplacement of warm seals.

Another object of the present invention resides in an internalcombustion engine of the type described above which not only assures auniform compression of the seals but also minimizes stresses in thevarious parts.

These and other objects, features and advantages of the presentinvention will becme more apparent from the following description whentaken in connection with the accompanying drawing which shows, forpurposes of illustration only, one embodiment in accordance with thepresent invention and wherein:

The single FIGURE is a partialcross-sectional view through the crankcaseand cylinder head of an internal combustion engine in accordance withthe present invention.

Referring now to the single FIGURE of the drawing,v

reference numeral 1 designates therein the separating surface of thecrankcase 2. The radial collar 3 of the wet cylinder liner 4 is mounteddirectly on the separating surface 1 of the crankcase 2. The collar 3 issealed with respect to the separating surface 6 of the cylinder head 7by means of a metallic gas seal 5 of conventional construction. Adistance or spacer plate 8 is inserted between the crankcase 2 and thecylinder head 7; the spacer plate 8 is provided with an aperture 9 forthe collar 3 and with a cooling water passage generally designated byreference numeral 10 between thecrankcase 2 and the cylinder head 7. Thecooling water through-passage 10 connects a cooling water space 11 ofthe cylinder head 7 with the annular cooling water sponding bore 13 and14. The intermediate pipe 17 is provided with a radial collar 18 withinthe area of the aperture 9. One annular seal 19 and 20 each is arrangedbetween the collar 18, on the one hand, and the separating suraces 1 and6, on the other, respectively.

The three separating joints between the crankcase 2 and the collar 3,between the collar 3 and the gas seal I 5 as well as between the gasseal 5 and the cylinder head 7 are sealed off in a liquid-tight manerwith respect to the cooling water through-passage 10 by means of theparts 18, 19 and 20.

While I have shown and described only one embodiment in accordance withthe present invention, it is understood that the same is not limitedthereto but is suceptible of numerous changes and modifications as knownto those skilled in the art, and I therefore do not wish to be limitedto the details shown and described herein but intend to cover all suchchanges as are encompassed by the scope of the appended claims.

What I claim is:

1. An internal combustion engine which includes a crankcase, a cylinderhead secured at the crankcase by means of cylinder head bolts, saidcylinder head and crankcase being provided with mutually facing sepa- Vrarting surfaces, spacer means arranged between the cylinder head andcrankcase within the area of the cylinder head bolts, liquid-cooledcylinder liner means provided with a radial collar mounted on theseparating surface of the crankase facing the cylinder had, a passagebeing provided for the cooling water between the cylinder head and thecrankcase, intemediate pipe -means inserted into said passage andannular seal 3. An internal combustion engine according to claim 1,characterized in that the spacer means are substantially non-yieldingand rigid.

4. An internal combustion engine according to claim 3, characterized inthat the radial collar of the liquidcooled cylinder liner means ismounted directly on the separating surface of the crankcase facing thecylinder head.

5. An internal combustion engine according to claim {characterized inthat the ends of the pipe means are inserted axially displaceably onboth sides of the collar means into a respective bore provided in thecylinder head and the crankase.

6. An internal combustion engine according to claim 1, characterized inthat the radial collar of the liquidcooled cylinder liner means ismounted directly on the separating surace of the crankcase facing thecylinder head.

1. An internal combustion engine which includes a crankcase, a cylinderhead secured at the crankcase by means of cylinder head bolts, saidcylinder head and crankcase being provided with mutually facingseparating surfaces, spacer means arranged between the cylinder head andcrankcase within the area of the cylinder head bolts, liquid-cooledcylinder liner means provided with a radial collar mounted on theseparating surface of the crankcase facing the cylinder head, a passagebeing provided for the cooling water between the cylinder head and thecrankcase, intermediate pipe means inserted into said passage andannular seal means for sealing said passage, characterized in that theintermediate pipe means includes a substantially radial collar means,and in that an annular seal means is inserted between the separatingsurface of the cylinder head and the collar means as also between theseparating surface of the crankcase and the collar means.
 2. An internalcombustion engine according to claim 1, characterized in that the endsof the pipe means are inserted axially displaceably on both sides of thecollar means into a respective bore provided in the cylinder head andthe crankcase.
 3. An internal combustion engine according to claim 1,characterized in that the spacer means are substantially non-yieldingand rigid.
 4. An internal combustion engine according to claim 3,characterized in that the radial collar of the liquid-cooled cylinderliner means is mounted directly on the separating surface of thecrankcase facing the cylinder head.
 5. An internal combustion engineaccording to claim 4, characterized in that the ends of the pipe meansare inserted axially displaceably on both sides of the collar means intoa respective bore provided in the cylinder head and the crankcase.
 6. Aninternal combustion engine according to claim 1, characterized in thatthe radial collar of the liquid-cooled cylinder liner means is mounteddirectly on the separating surface of the crankcase facing the cylinderhead.